Add dev dependencies to pyproject.toml (#8661)

* Add `dev` dependencies to `pyproject.toml`

pyproject.toml

@@ -28,6 +28,24 @@ dependencies = [
   "pandas>=1.5",
 ]
 
+[project.optional-dependencies]
+accel = ["scipy", "bottleneck", "numbagg", "flox", "opt_einsum"]
+complete = ["xarray[accel,io,parallel,viz,dev]"]
+dev = [
+  "hypothesis",
+  "pre-commit",
+  "pytest",
+  "pytest-cov",
+  "pytest-env",
+  "pytest-xdist",
+  "pytest-timeout",
+  "ruff",
+  "xarray[complete]",
+]
+io = ["netCDF4", "h5netcdf", "scipy", 'pydap; python_version<"3.10"', "zarr", "fsspec", "cftime", "pooch"]
+parallel = ["dask[complete]"]
+viz = ["matplotlib", "seaborn", "nc-time-axis"]
+
 [project.urls]
 Documentation = "https://docs.xarray.dev"
 SciPy2015-talk = "https://www.youtube.com/watch?v=X0pAhJgySxk"
@@ -38,13 +56,6 @@ source-code = "https://github.com/pydata/xarray"
 [project.entry-points."xarray.chunkmanagers"]
 dask = "xarray.core.daskmanager:DaskManager"
 
-[project.optional-dependencies]
-accel = ["scipy", "bottleneck", "numbagg", "flox", "opt_einsum"]
-complete = ["xarray[accel,io,parallel,viz]"]
-io = ["netCDF4", "h5netcdf", "scipy", 'pydap; python_version<"3.10"', "zarr", "fsspec", "cftime", "pooch"]
-parallel = ["dask[complete]"]
-viz = ["matplotlib", "seaborn", "nc-time-axis"]
-
 [build-system]
 build-backend = "setuptools.build_meta"
 requires = [
@@ -273,5 +284,5 @@ test = "pytest"
 
 [tool.repo-review]
 ignore = [
-  "PP308" # This option creates a large amount of log lines.
+  "PP308", # This option creates a large amount of log lines.
 ]